Issued Patents All Time
Showing 1–16 of 16 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5497823 | Energy recovery ventilator: means for defrosting heat exchanger medium and damper motor actuation means | — | 1996-03-12 |
| 5458187 | Dual core air-to-air heat exchanger | — | 1995-10-17 |
| 5435817 | Portable room air purifier | Joseph J. Kopp, Jr., John A. McMillan | 1995-07-25 |
| 5431215 | Pressure switch for energy recovery ventilator | — | 1995-07-11 |
| 5348563 | Air purifying apparatus | — | 1994-09-20 |
| 4678926 | Christmas tree lighting control | — | 1987-07-07 |
| 4629482 | HEPA room air purifier | — | 1986-12-16 |
| 4560395 | Compact blower and filter assemblies for use in clean air environments | — | 1985-12-24 |
| 4376498 | Hand-held pneumatic caulking gun | — | 1983-03-15 |
| 4273269 | Hand held electric caulking gun | — | 1981-06-16 |
| 4267769 | Prefabricated knockdown clean room | Robert W. Irving | 1981-05-19 |
| 4264021 | Hand held electric caulking gun | — | 1981-04-28 |
| D258797 | Hand held electric caulking gun | — | 1981-04-07 |
| 4253082 | Resistance disk | — | 1981-02-24 |
| 4249677 | Hand held electric caulking gun | — | 1981-02-10 |
| 4184616 | Wire coat hanger attachment | — | 1980-01-22 |